I've had and still have issues with trigger points. I think the best way to get after them aside from everything you are doing now is to work on them briefly but many times throughout the day.
I found a good overview and treatment guide is found in the Trigger Point Therapy Workbook. https://www.amazon.com/Trigger-Point...K1XKMMWN78NKSY
I'm sure you already know this but many times trigger points are not located at the location of the pain but referred pain from another location. I found that book to be really helpful in tracking them down and how to treat them.